When he came into the dining hall, nobody said hello to him. So he felt      .

As there is less and less coal and oil, scientists are exploring new ways of making use  of ______________   energy, such as sunlight, wind and water for power and fuel.

Your suggestion on how to improve English writing ability is too general. Could you make it more _______?

This book _____ the life of the students is popular with the teenagers.

——Oh, I need help, doctor. Things aren't going all that well.——Like what？Can you be more _____ ？